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... May 19, 2010Certain Motor Coach Industries MCI buses are designed with naturally aspirated air compressors on models with Detroit Diesel engines in order to comply with EPA requirements ... . Inspectors may hear this leak and consider it an OOS condition as an audible air leak.BackgroundMCI models D4000, D4500, E4500, J4500, and G4500 manufactured prior ... pressure cut off at 125psi the purge valve closes but the compressor continues to pump air until next purge cycle. MCI models D4000, D4500, E4500, J4500, and G4500 ... on G4500 model coaches, Motor Coach Industries ( MCI ) made changes in the air system to comply with Detroit Diesel's requirement that the new EGR equipped engines have ... naturally aspirated air compressors. This change was made by Detroit Diesel in order to meet the ... shut off the engine and this noise will cease. If it continues or other air sounds are heard, investigate further. If you have further questions or concerns, please ...